HtmlButton.CausesValidation Properti

Referensi

Definisi

Ruang nama:: System.Web.UI.HtmlControls

Rakitan:: System.Web.dll

Penting

Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.

Mendapatkan atau menetapkan nilai yang menunjukkan apakah validasi dilakukan saat HtmlButton kontrol diklik.

public:
 property bool CausesValidation { bool get(); void set(bool value); };

public:
 virtual property bool CausesValidation { bool get(); void set(bool value); };

public bool CausesValidation { get; set; }

public virtual bool CausesValidation { get; set; }

member this.CausesValidation : bool with get, set

Public Property CausesValidation As Boolean

Public Overridable Property CausesValidation As Boolean

Nilai Properti

Boolean

true jika validasi dilakukan saat HtmlButton kontrol diklik; jika tidak, false. Nilai defaultnya adalah true.

Contoh

Contoh kode berikut menunjukkan cara menggunakan CausesValidation properti untuk mencegah validasi halaman terjadi. Perhatikan bahwa metode mengaktifkan Validate setiap kontrol validasi secara independen.


<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" > 

<head>
    <title> HtmlButton CausesValidation Example </title>
<script runat="server">

      void SubmitButton_Click(Object sender, EventArgs e)
      {
         
         // Determine which button was clicked.
         switch(((HtmlButton)sender).ID)
         {

            case "CityQueryButton":

               // Validate only the controls used for the city query.
               CityReqValidator.Validate();

               // Take the appropriate action if the controls pass validation. 
               if (CityReqValidator.IsValid)
               {
                  Message.InnerHtml = "You have chosen to run a query for the following city: " + 
                     CityTextBox.Value;
               }

               break;

            case "StateQueryButton":

               // Validate only the controls used for the state query.
               StateReqValidator.Validate();

               // Take the appropriate action if the controls pass validation.
               if (StateReqValidator.IsValid)
               {
                  Message.InnerHtml = "You have chosen to run a query for the following state: " + 
                     StateTextBox.Value;
               }

               break;

            default:

               // If the button clicked is not recognized, erase the message on the page.
               Message.InnerHtml = "";

               break;

         }
        
      }

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3> HtmlButton CausesValidation Example </h3>

      <table border="1" cellpadding="10">
         <tr>
            <td>
               <b>Enter city to query.</b> <br />
               <input id="CityTextBox" 
                      type="Text"
                      runat="server"/>
               <asp:RequiredFieldValidator ID="CityReqValidator"
                    ControlToValidate="CityTextBox"
                    ErrorMessage="<br />Please enter a city."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="CityQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

         <tr>
            <td>
               <b>Enter state to query.</b> <br />
               <input id="StateTextBox" 
                      type="Text" 
                      runat="server"/>
               <asp:RequiredFieldValidator ID="StateReqValidator"
                    ControlToValidate="StateTextBox"
                    ErrorMessage="<br />Please enter a state."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="StateQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

      </table>

      <br /><br />

      <span id="Message"
            runat="Server"/>


   </form>

</body>
</html>


<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" > 

<head>
    <title> HtmlButton CausesValidation Example </title>
<script runat="server">

      Sub SubmitButton_Click(sender As Object, e As EventArgs)
         
         ' Determine which button was clicked.
         Select Case (CType(sender, HtmlButton)).ID

            Case "CityQueryButton"

               ' Validate only the controls used for the city query.
               CityReqValidator.Validate()

               ' Take the appropriate action if the controls pass validation. 
               If CityReqValidator.IsValid Then
           
                  Message.InnerHtml = "You have chosen to run a query for the following city: " & _ 
                     CityTextBox.Value
               
               End If

            Case "StateQueryButton"

               ' Validate only the controls used for the state query.
               StateReqValidator.Validate()

               ' Take the appropriate action if the controls pass validation.
               If StateReqValidator.IsValid Then
               
                  Message.InnerHtml = "You have chosen to run a query for the following state: " & _ 
                     StateTextBox.Value
               
               End If

            Case Else

               ' If the button clicked is not recognized, erase the message on the page.
               Message.InnerHtml = ""

         End Select
        
      End Sub

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3> HtmlButton CausesValidation Example </h3>

      <table border="1" cellpadding="10">
         <tr>
            <td>
               <b>Enter city to query.</b> <br />
               <input id="CityTextBox" 
                      type="Text"
                      runat="server"/>
               <asp:RequiredFieldValidator ID="CityReqValidator"
                    ControlToValidate="CityTextBox"
                    ErrorMessage="<br />Please enter a city."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="CityQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

         <tr>
            <td>
               <b>Enter state to query.</b> <br />
               <input id="StateTextBox" 
                      type="Text" 
                      runat="server"/>
               <asp:RequiredFieldValidator ID="StateReqValidator"
                    ControlToValidate="StateTextBox"
                    ErrorMessage="<br />Please enter a state."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="StateQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

      </table>

      <br /><br />

      <span id="Message"
            runat="Server"/>


   </form>

</body>
</html>

Keterangan

Secara default, validasi halaman dilakukan saat HtmlButton kontrol diklik. Validasi halaman menentukan apakah kontrol input yang terkait dengan kontrol validasi pada halaman semuanya melewati aturan validasi yang ditentukan oleh kontrol validasi.

Anda dapat menentukan atau menentukan apakah validasi dilakukan pada klien dan server saat HtmlButton kontrol diklik dengan menggunakan CausesValidation properti . Untuk mencegah validasi dilakukan, atur properti ke CausesValidationfalse.

Properti ini biasanya digunakan dalam penanganan aktivitas untuk kejadian agar ServerClick validasi halaman tidak terjadi ketika tombol Batal atau Reset diklik.

Berlaku untuk

Bagikan melalui